Improved stop motion



UNITED STATES PATENT OFFICE.

BENJAMIN STOTT, OF WESTERLY, RHODE ISLAND.

IMPROVED STOP MOTION.

Specification forming part of Letters Patent No. 44,024, dated August 30, 1864.

To all whom it may concern:

Be it known that l, BENJAMIN Sro'rr, ot' Vesterly, in the county of Washington and State of Rhode Island, have invented a certain new and Useful Stop-Motion, adapted to use on rotary fulling-mills and other machinery; and I do hereby declare that the following is a full and exact description th( reof, reference being had to the annexed drawing, which is an elevation of my said improvement.

In rotary fullingmills, in which the cloth is passed in an endless belt alternately through suds and between pressure rollers, much difficulty has been experienced because of the tingling of the cloth and its tendency to be presented in knots and bunches to the rollers so as to clog them, causing the upper or pressure roll to stop, and a consequent a'nasfon of the cloth. A device has been made for stopping the machine, when such a diculty is presented, by means of two fingers, between which the cloth passes 011 its way to the rolls, and whic11,being acted upon by the knots, throw Off the belt and stop the machine; but this has not been found to remedy the evil entirely, as sometimes bunches which pass the fingers will be presented in a man ner as t0 clog the rolls, while others, which would cause no inconvienence in themselves, act upon the fingers and stop the machine, thus producing unnecessary delays.

In my improved stopmotion the stoppage ot' the upper roller will cause the belt t) be instantly thrown off, while any bunch or knot which does not produce this effect passes through without stopping the machine.

Thenature of my invention consists in causing the belt shipper 7 or guideto be held in position by centrifugal force in such a manner that when the said centrifugal force is lessened beyond a certain iixedamounta weight, spring, or other automatic force is permitted to shift the belt upon the loose pulley, and thus stop the machine.

To enable others skilled in the art to make and use my invention, l will proceed to describe the construction and operation of the same, reference being had the drawing and the letters of reference marked thereon.

a is an upright spindle, deriving its rotary motion through a belt, c,from the upper roller ofa falling-mill, or from a suitable portion of any other machine to which my invention may be applied. Near the upper end of this spindle are two radial arms, b b, which carry each a weight, c, capable of sliding thereon,

but prevented by collars b b from sliding oft the ends thereof.

w is a weight, capable of sliding vertically on the spindle a, and connected to the weights c c by cords or chains d d, passing over pulleys e, one on each side of the spindle a., at the junction of the arms b. A forked arm, g, on the shaft h takes into agroove in the weight win such a manner that as the weight zc slides upon the spindle a., the shaft h is rotated, and the belt-shipper t', attached thereto, is operated so as to shift or ship the belt t'rom the tight to the loose pulley, and vice versa. A rapid rotary motion being impartedto the spindle a, the weights c, by virtue of their centrifugal force, hold the weigh t to suspended, as shown in strong black lilies, and the belt is kept upon the tight pulley; but when from any cause the speed is so far slackened that the centrifugal force is notsufficient tosupport the weight w, it falls, as shown'n red outline, and thus throws oft' the belt and causes themachine to stop.

When the belt shipper is operated by hand to start the machine, the weight w is lifted, and immediately the machine is in motion, the weights c c assume their positions for holding it suspended and the shipper in place. If it be desired to stop the machine at any time, by exerting sufficient power to overcome the centrifugal force of the weights c c the belt may be thrown ofifin the usual manner.

When attached to a fulling mill,as described, the spindle t derives its motion from the upper roller, and when this roller is stopped by a bunch in the cloth or other cause the whole machine is caused to stop also, and no damage can therefore be done to the cloth.

lt is evident that a spring or other epiivalent means may be made to take the place of the weight w and produce the same e"."e et.

What I claim as new, and desire to secure by Letters latent, in my said invention, is-

Holding a belt-shipper in position by means of centrifugal force, so arranged that when the said force is diminished beyond a given amount a weight or other automatic force shall shift the belt, substantially as and for the purpose herein set forth.

In testimony whereof I have hereunto set iny-name in presence of two subscribing witnesses.

BENJAMIN STUTT.

IVitnesses:

ROBERT L. VILLTAMS, CHARLES SAEIN. 

